<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>task3</title>
    <style>
        .show{
            position:fixed;
            height:30px;
            width:100%;
            background-color:lightblue;
            text-align:center;
            top: 0;
            left: 0;
        }
        p{
            margin: 2px;
            padding: 0;
        }
        .fk{
            height:150px;
            width:150px;
            display:inline-block;
            background-color: lightcoral;
            margin: 5px;
            padding: 5px; 
            border-radius: 10%;  
            margin-top: 20px;       
        }
        .fk:hover{
            background-color: lightblue;
        }
        .fk:active{
            background-color: white;
        }
        
    </style>
</head>
<body>
    <div class="show">
        <p>展示</p>
    </div>
    
    <div class="ad fk">
        <p>ad</p>
    </div>
    
    <div class="div2 fk">
        <p>2</p>
    </div>
    
    <div class="div3 fk">
        <p>3</p>
    </div>
    
    <div class="div4 fk">
        <p>4</p>
    </div>
    <div class="div2 fk">
        <p>2</p>
    </div>
    
    <div class="div3 fk">
        <p>3</p>
    </div>
    
    <div class="div4 fk">
        <p>4</p>
    </div>
    <div class="div2 fk">
        <p>2</p>
    </div>
    
    <div class="div3 fk">
        <p>3</p>
    </div>
    
    <div class="div4 fk">
        <p>4</p>
    </div>
    <div class="div2 fk">
        <p>2</p>
    </div>
    
    <div class="div3 fk">
        <p>3</p>
    </div>
    
    <div class="div4 fk">
        <p>4</p>
    </div>
    <div class="div2 fk">
        <p>2</p>
    </div>
    
    <div class="div3 fk">
        <p>3</p>
    </div>
    
    <div class="div4 fk">
        <p>4</p>
    </div>
    <div class="div2 fk">
        <p>2</p>
    </div>
    
    <div class="div3 fk">
        <p>3</p>
    </div>
    
    <div class="div4 fk">
        <p>4</p>
    </div>
</body>
</html>
